thks @gazumped for the note about asking the support , I'll do that. but what is the purpose of this section of the forum called "evernote team resquest" if the evernote team does not read it ?? name is misleading ...
my question is not about using a data center (if @pinkelephant has reference to study about the difference of impact between centralized data center and more distributed solution, I'd be interested, because I know some people are investigating solutions for data center shared by inhabitants of an urban building. have not found anything about the difference of impact though)
because my question is about the stream over internet Resources consumption is not just about the data center itself, it is also about sending information over the network. as I was illustrating in my question, I have a feeling sending typo and correction back and forth over the network use more resources than making the modifications locally and only sending modification to the cloud every now and then, they way it was done before v10. but intuition can be wrong, hence my question about an evaluation of the impact of this change in v10.
because trying to use more renewable energy is well and good but the most certain way of reducing our environmental impact is to reduce our use of resources in every possible ways !...